Screen bar for crushing machinery



Feb. 11,1930. Q v J. E. STINE ,7 6,563

SCREEN BAR FOR CRUSHING MACHINERY Filed June 29, 1928 INVENTDR= JamesE Shae,

Patented Feb. 11, 1930 UNITED STATES JAMES E. s'rINnor ALDAN, PENNSYLVANIA, ASSIGNOR ro PENNSYLVANIA onusrrnn PATENT OFFICE- COMPANY, or NEW YORK, N. .Y.,

A CORPORATION OF NEW YORK SCREEN BAR FOR CRUSHING MACHINERY Application filed .Tune 29,

. My invention relates to crushing machinery, more particularly hammer crushers, employed inthe reduction of coal, ore, stone, and the like,and one object of my invention is to provide an improved form of screen bar employed in making up the discharge grid or screen of structures of this type; such grid or screen being disposed substantially ioconcentric with respect to the path of the crushing ofmaterial operated upon by beathammers which effect the breaking and/or ing such material against the edges of the barsmaking up such grid or screen."

j A further object of my invention is to provide a self-spacing bar; such bar having lateral projections disposed at intervals, which projections may be disposed upon 0pposite faces ofthe barand integral therewith or not, as the case may be.

And a still further object of my invention is to provide a barhaving interlocking means whereby it may be held against radial movement; such interlocking means being associated with the spacing lugs or projections.

My improved grid or screen bar, having a substantially rectangular contour, is of the reversible type so that when one active edge isworn, it may be reversed byturning the same upslde down or end forend, as the casemay be, in orderthat all four active edges of the bar may be brought into cooperative relation with the grid or screen.

These and other features of my invention are more fully described hereinafter; reference being had. to the accompanying drawings, in which Figure 1 is a cross sectional elevation,.more or less diagrammatic in character,of one form of crushing machinery in which my improved screen bar may be. employed.

Fig. 2 is a perspective view of one of the bars shown in Fig. 1. l l

Fig. 3 is an end elevation of a pair of the bars Shown in Figs. 1 and 2.

Fig. i is a perspective view of modified form or interlocking bar within the scope of my invention; and

Fig. 5 is an end elevation of a pair of bars ofthe type shown in Fig. 4.

y improved screen bar is available for 1928. Serial No. 289,251.

use with many forms of crushing machinery, more particularly those of the hammer type, and Fig. 1 illustrates more or less diagrammaticall a hammer crusher having the usual cage or 'rame .1, pivotally mounted at 2, and havingsemrcircular grooves 3 at the sides, providing seats for the reception of the ends of bars 4, which make up the grid or screen constituting the cage and against which the crushing or breaking action takes place un der the action of hammers such as indicated at 5. These hammers may be pivotally mounted on rods 6. carried by disks 7, supported by a shaft 8; such parts constituting the rotor element of the crushing machine.

The frame or ca e 1 carr in the bars 4: is

pivotally mounted 1n the usual manner, so

as to permit adjustment of the grid or screen formed by said bars awith respect to the active edges of the bar. The projections 10 are preferably beveled in two directions with respect to the side faces of the bar, so that when disposed in the crusher structure to form the grid or screen of the crushing structure in proper relative position with respect to the rotor element one of the beveled faces of each of such projections will be in contact substantially throughout its entire area with a similarbeveled face of the projection of an adjacent bar, and such contacting surfaces will lie in radial planes or in planes .substantially parallel to radial planes passing throughout adjacent bars. In the form of bars illustrated herein, each face of the same is provided with spacing projections and the extent of their lateral projection with respect to said bars determines the distance between the severalbars in the formation of the grid or screen, which distance may differ for different types of material undergoing crushing action.

In addition to the arrangement providing for contact of the beveled faces of the projeetions of the several bars, these projections are arranged for interlocking engagement with each other. For this purpose I provide each projection '10 with complemental engaging means in the form of recesses and lugs. In the type of'bar illustrated in Figs. 1, 2 and 3, each projection 10 is provided with a recess 11 and a lug 12; such recesses and lugs having the same contour so that the lug of one projection may fit the recess formed in the projection of an adjacent bar, and vice versa. By the use of such interlocking means the bars are held against radial movement, and chattering of the bars when the machine is in action is prevented. 'As the bars are maintained in position with re spect to each other and tothe'p ath of the hammers, any tendency of the bars to jump out of position and occasion additional wear both in their seats and on the active edges of the same is avoided.

' In the form of bar illustrated in Figs. 4 and 5, the several projections 10 are provided with single lugs 12 or recesses 11*,and in order that single bars of such arrangement may have their position altered with respect to the adjacent bars without dismantling the entire set, the projections at one end and one side of the bar may have recesses and those on the same side and at the opposite end of the bar may have lugs; the oppositely disposed projections being provided with complemental lugs and recesses in reverse arrangement, as clearly indicated in Figs. l and 5. When such form of bar is reversed to change the active cutting edge from a to b, for instance, it will be simply turned from end to end without changing itsradial position. The form of bar shown in Figs. 1, 2 and 3, however, will be reversed in a radial direction if a single bar is replaced. In both instances the replacement or reversal of a complete set of bars maybe in either direction, as may be desired.

It willbe understood that I may provide a bar of the type illustrated in Figs. 4 and 5, in which all of the projections on one side of the bar have lugs and those on the other side have complemental recesses, without departing from my invention.

By preference, the projections are integral with the bars although it will be understood that such projections may be secured to the bars by riveting or in any other suitable manner, as in the form of bar illustrated in the patent of George WV. Borton, No. 1,624,886,dated April 12, 1927, and in some instances such projections may be welded to the bars. By preference, each bar is provided with a plurality of these projections, al-

though it will be understood that a single set of projections, adjacent each end of the bars may be sufiicient under some conditions and with some types of crushing machinery.

As in the bar forming the subject of the Borton patent referred to, my improved bars are reversible and replaceable so as to take advantage of all four of the working edges which may be successively brought into proper position relatively to the direction of movement of the hammers.

Preferably, the several projections will be beveled in the same manner indicated; the recesses and lugs of such projections being struck from axes coinciding with the planes of the beveled portions of each projection and the faces 'of such beveled portions being tangent to the plane of the side walls of the bars with the contacting portions of such beveled planes lying in radial planes or in planes substantially parallel with radial lines passing through adjacent bars. Such arrangement is not essential, however, and in some instances the beveling of the meeting faces of the projections may be greater, or omitted entirely, so long as proper cooperation of the interlocking elements is effected.

\Vhile I have shown interlocking projections which are curved and substantially semi-circular in contour it will be understood that such projections may be of any shape or contour capable of interlocking engagement, without departing from my invention.

I claim:

1. A screen bar for crushing machinery having a plurality of spacing lugs projecting from a face of said bar at right angles with respect to the longitudinal axis thereof; each lug being provided with cooperative interlocking means for complemental engagement with the lugs of an adjacent bar.

2. A screen bar for crushing machinery having a plurality of spacing lugs disposed inwardly with respect to the edges of the bar and projecting from a side thereof at right angles with respect to the longitudinal axis Of tlle bar; each lug being provided with cooperative interlocking means for complemental engagement with the lugs of an adjacent bar.

3. A screen bar for crushing machinery having a plurality of spacing lugs disposed inwardly with respect to the several edges of the bar on both sides of the same and projecting at right angles with respect to the longitudinal axis of the bar; each lug being provided with cooperative interlocking means for complemental engagement with the lugs of an adjacent bar.

4. A screen bar for crushing machinery having side projections extending laterally for contact with similar projections of an adjacent bar; certain of said projections having lugs and others being recessed for intereach of said spacing projections locking engagement with similar projections of an adjacent bar.

5. A screen bar for crushing machines of the hammer mill type comprisng rectangularmembers whose ends are arranged to seat a in semi-circular channels and havingspacing projections on opposite sides of the same; having a lug and recess for complemental engagement with recesses and lugs of a similar spacing projection of an adjacent bar.

6. A screen bar for crushing machines of the hammer mill type comprising rectangular members whose ends are arranged to seat in semicircular channels of the crushing machine and having spacing projections arranged in oppositely disposed pairs on the respective sides of the same; each of said spacing projections having inwardly beveled faces provided with a lug and recess for complemental engagement with recesses and lugs of a similar spaced projection of an adjacent bar. 7 a a i In Witness whereof I have signed this specification.

. JAMES E. STINE. 

